/*
 * Copyright (c) 2010, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "alkes/tree/ScissorStack.h"

namespace alkes {

ScissorStack::ScissorStack()
: depth_(0)
, x_(0), y_(0)
{
}

void ScissorStack::reset()
{
    depth_ = 0;
}

void ScissorStack::addOffset(int16_t x, int16_t y)
{
    x_ += x;
    y_ += y;
}

void ScissorStack::minusOffset(int16_t x, int16_t y)
{
    x_ -= x;
    y_ -= y;
}

void ScissorStack::pushGlobalScissor(const Rect& scissor)
{
    if (!depth_)
        stack_[0] = scissor;
    else
    {
        stack_[depth_] = intersect(stack_[depth_-1], scissor);
    }

    ++depth_;
}

void ScissorStack::pushLocalScissor(const Rect& scissor)
{
    Rect rect(scissor);

    rect.x += x_;
    rect.y += y_;

    pushGlobalScissor(rect);
}

void ScissorStack::pushScissorSize(int16_t w, int16_t h)
{
    Rect rect = {
        x_, y_, w, h
    };

    pushGlobalScissor(rect);
}

void ScissorStack::popScissorRect()
{
    if (depth_)
        --depth_;
}

const Rect& ScissorStack::getCurrentRect() const
{
    if (depth_ < 0)
    {
        AL_ERROR("Invalid scissor depth.");
        return stack_[0];
    }

    return stack_[depth_ - 1];
}

const Rect& ScissorStack::getPrevRect() const
{
    if (depth_ < 1)
    {
        AL_ERROR("Invalid scissor depth.");
        return stack_[0];
    }

    return stack_[depth_ - 2];
}

}
